package day11;  

public class PersonTest { 
    public static void main(String[] args) { 
        Person p1 = new Person("jack",20); 
        p1.show(); 

        System.out.println(); 

        Person p2 = new Person("lucy"); 
        p2.show(); 

        System.out.println(); 

        Person p3 = new Person(18);
        p3.show();

    }
}